DataReader, DataSourcepublic final class FileDataSource extends BaseDataSource
DataSource for reading local files.| Modifier and Type | Class | Description |
|---|---|---|
static class |
FileDataSource.Factory |
DataSource.Factory for FileDataSource instances. |
static class |
FileDataSource.FileDataSourceException |
Thrown when a
FileDataSource encounters an error reading a file. |
| Constructor | Description |
|---|---|
FileDataSource() |
| Modifier and Type | Method | Description |
|---|---|---|
void |
close() |
Closes the source.
|
Uri |
getUri() |
When the source is open, returns the
Uri from which data is being read. |
long |
open(DataSpec dataSpec) |
Opens the source to read the specified data.
|
int |
read(byte[] buffer,
int offset,
int readLength) |
Reads up to
length bytes of data from the input. |
addTransferListener, bytesTransferred, transferEnded, transferInitializing, transferStartedgetResponseHeaderspublic long open(DataSpec dataSpec) throws FileDataSource.FileDataSourceException
DataSource
Note: If an IOException is thrown, callers must still call DataSource.close() to ensure
that any partial effects of the invocation are cleaned up.
dataSpec - Defines the data to be read.DataSpec.length equals C.LENGTH_UNSET) this value
is the resolved length of the request, or C.LENGTH_UNSET if the length is still
unresolved. For all other requests, the value returned will be equal to the request's
DataSpec.length.FileDataSource.FileDataSourceExceptionpublic int read(byte[] buffer,
int offset,
int readLength)
throws FileDataSource.FileDataSourceException
DataReaderlength bytes of data from the input.
If readLength is zero then 0 is returned. Otherwise, if no data is available because
the end of the opened range has been reached, then C.RESULT_END_OF_INPUT is returned.
Otherwise, the call will block until at least one byte of data has been read and the number of
bytes read is returned.
buffer - A target array into which data should be written.offset - The offset into the target array at which to write.readLength - The maximum number of bytes to read from the input.C.RESULT_END_OF_INPUT if the input has ended. This
may be less than length because the end of the input (or available data) was
reached, the method was interrupted, or the operation was aborted early for another reason.FileDataSource.FileDataSourceException@Nullable public Uri getUri()
DataSourceUri from which data is being read. The returned
Uri will be identical to the one passed DataSource.open(DataSpec) in the DataSpec
unless redirection has occurred. If redirection has occurred, the Uri after redirection
is returned.Uri from which data is being read, or null if the source is not open.public void close()
throws FileDataSource.FileDataSourceException
DataSource
Note: This method must be called even if the corresponding call to DataSource.open(DataSpec)
threw an IOException. See DataSource.open(DataSpec) for more details.